That's weird behavior from the child. He can't do that to people. I don't know if hitting him in the back is the correct thing to do, but adults have to do something to stop that behavior. This is not something that i'm familiar with. But I would take action to stop the violence against you by the kid. Of course how you deal with it has to be controlled and appropriate. She will have her hands full with him after you leave. I wonder if he is acting out the hostility that he perceives she has toward you. Is he punishing you because Mommy is angry at you?
